Overview and Evaluation of Current Situation of Acoustic Environment (1) Overview of the Quality of Acoustic Environment of Xining(1) Overview of the Quality of Acoustic Environment of Xining

According to the Xining Environment Quality Bulletin (2011):

Noise of regional environment: In 2011, the noise of regional environment was at a relatively good level in terms of the acoustic environment of the whole city. The average equivalent sound level of noise of regional environment of Xining was 53.6db, an increase by 0.4db than that in 2010. In terms of the composition of noise source, domestic noise accounted for 52.7% and caused the biggest impact, other noises accounted for 26.8%, traffic noise 14.3%, and construction and industrial noises accounted for 4.9% and 1.3%, respectively. Compared with that of 2010, construction noise increased by 4.4%, and industrial noise dropped by 3.6%.

Road traffic noise: In 2011, the equivalent sound level of the traffic noise of 35 main roads of Xining was in the range of 64.2—72.1db and the average equivalent sound level of traffic noise of Xining urban areas was 69.7db, an increase by 0.2db than the previous year and presenting relatively good urban traffic environment quality. The length of road of which the traffic noise exceeds 70db is 47.5km with over limit rate of 55.4%. Compared with last year, the over limit rate increased by 5.1

%.

(2) Monitoring of Quality of Acoustic Environment of Project Area

Data in EIA for No.4 WWTP (based on monitoring conducted in 2011), EIA for No.5 WWTP (based on monitoring conducted in 2012) and EIA for Beichuan River Plan (based on monitoring in 2012) were refered to during this EIA. The referenced data are all results of monitoring conducted in 2011 and 2012, within the time interval for reference purpose. Moreover, these data are from sites that are largely overlapping with the project construction sites, and are thus capable of representing status of acoustic environment in the WWTPs and of the sewage collection pipes. The monitoring scheme and results are as follows:

Monitoring point: See table 3.3-1 and Figure 3.3-1 for arrangement of monitoring points.

Monitoring factor: Equivalent sound level LAeq (synchronously recording the weather condition at the monitoring site)

Monitoring time and frequency: Time of monitoring at No. 4 WWTP is March 3, 2011 during 8:00-22:00 and 22:00-8:00. Time of monitoring at No. 5 WWTP is September 2012 during 8:00-12:00 and 14:00-18:00 in daytime and at 22:00 at night.

Monitoring for EIA of Beichuan River Plan was conducted during the period from October 30 to 31, 2012, lasting two days and in two phases, i.e. daytime and

nighttime phases.

Monitoring method: Monitoring of acoustic environment was conducted according to relevant requirements in Environmental Quality Standard for Noise (GB3096—2008) and Emission Standard for Industrial Enterprises Noise at Boundary (GB 12348-2008)

Table 3.3-1A Arrangement of Monitoring Points for Quality of Noise Environment and Monitoring Results

Location Time of

Monitoring Monitoring Point Description Results

Daytime Nighttime No.4 WWTP; Beichuan sewage collection pipes and a small amount of

traffic noise. and a small amount of traffic noise, such

results are

representative.

50.5 36.0

East Side of Plant 58.8 43.1

South Side of Plant 56.9 34.0

West Side of Plant 52.6 45.2

North Side of Plant 49.2 44.8

Residential Area of

East Side of Plant 47.5 41.2

South Side of Plant 52.3 46.5

West Side of Plant 48.9 42.8

North Side of Plant 47.1 41.6

Shuangsubao Village at South-east Side of

Plant

50.1 44.3

Class-II Standards in 《Quality Standard for Acoustic Environment》（GB3096—

2008） 60 50

South Side of Plant 52.6 47.3

West Side of Plant 51.8 47.3

North Side of Plant 52.8 49.5

August 13, 2013

East Side of Plant 55.8 50.4

South Side of Plant 53.0 45.6

West Side of Plant 52.1 56.3

North Side of Plant 52.6 48.6

Class-II Standards in 《Standard for Noise Emission on Boundary of Industrial

Enterprises》（GB 12348-2008） 60 50

Table 3.3-1 B Monitoring Results of Current Status of Noise in Beichuan Area

No.& Name of Monitoring Site Leq[dB（A）]

Oct.30, 2012 Oct.31, 2012

Daytime Nighttime Daytime Nighttime

1# Qijiacheng 52.4 42.2 53.3 41.7

2# Xinshiji Garden 55.6 44.1 54.1 45.5

3# Taoxin Village 51.7 40.9 52.2 43.2

4# Huaming Leisure Park 51.0 39.6 54.4 40.2

5# Jingya Primary School 52.4 37.5 51.8 39.7

6# Beihai Park 46.6 36.7 47.0 37.8

7# Xining No.25 Middle School 57.0 40.6 55.6 41.4

8#Ershilipu Village（West） 51.4 41.1 52.7 40.2

9# Kangjiaqiao 48.6 42.7 48.8 37.8

10# Ershilipu Village（East） 53.5 41.5 53.9 40.5

11# Provincial Drug Testing Institute 51.2 42.5 55.1 39.7

12# Zihengdijing Garden Residential Area 55.7 42.0 53.4 41.5

Monitoring results and evaluation: The results indicate that the level of noise monitored meets the requirements of class 2 standards of Environmental Quality Standard for Noise (GB3096-2008).

Located in a rural environment, the proposed wastewater interception main pipes connect Duoba town with No. 4 WWTP, along the pipeline quality of acoustic environment is better than where the No. 4 WWTP is located. Therefore, acoustic environment along Xichuan River wastewater interception main pipes is good.

Since Beichuan River wastewater interception main pipes from Datong wastewater treatment plant to toll station of Xining-Datong Highway are to be installed in rural environment, where quality of acoustic environment is better than that of No. 5 WWTP, so acoustic environment along the Beichuan River wastewater interception main pipes is good.

Based on monitoring data of current acoustic environment in Beichuan Area, noise at all sites monitoring is ranging from 46.6 to 57.0 dB(a) during daytime, and from 36.7 to 44.1 dB(A) during nighttime, Leq (dB(A)) monitoring values of both daytime and nighttime periods meet the requirements of Class II standard as defined in the Environmental Quality Standard for Noise (GB3096-2008), indicating good quality of current acoustic environment in Beichuan Area.

The land area where the rainwater and wastewater collection pipe network, low-impact development and river bank environmental improvement project components in Beichuan area are planned to be constructed has been acquired. The No. 5 WWTP is located at the northeast corner of the area where the project is to be constructed and close to Shuangsubao Village. The monitoring results of this plant can represent the current quality of acoustic environment of the area. The results indicate that the current quality of acoustic environment of Beichuan area and Shuangsubao Village is good and satisfies the requirements of class 2 standards of Environmental Quality Standard for Noise (GB3096-2008).

A, B, C, D, residential area of cereals and oils store and residential building of flour mill are noise monitoring points and E is noise and air monitoring point.

Figure 3.3.-1A Monitoring Point for Current Environment of No. 4 WWTP

A, B, C, D, and Shuangsubao are noise monitoring points and E is noise and air monitoring point.

Figure 3.3.-1B Monitoring Point for Current Environment of No. 5 WWTP

Figure 3.3-1C Noise Monitoring Points in Beichuan Area

3.3.2 Overview and Evaluation of Ambient Air